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WSB Engineering Carwash Noise Impact Assessment <br />David Braslau Associates, Inc. Page 7 <br /> <br />Figure 3-2 Spot Statistical Sound Spectral Reading <br />0 <br />10 <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <br />32 Hz 63 Hz 125 Hz 250 Hz 500 Hz 1k Hz 2k Hz 4k Hz 8k HzSound Level (dB)Octave Band (Hz) <br />Lxx Spectra <br />L1 <br />L10 <br />L50 <br />L90 <br />L99 <br />73